aux: add {Meta,Pointee}Sized to minicore

Add `MetaSized` and `PointeeSized` to minicore so that fewer tests fail
from missing language items.

Author: davidtwco

tests/auxiliary/minicore.rs

@@ -40,8 +40,14 @@ macro_rules! impl_marker_trait {
     }
 }
 
+#[lang = "pointeesized"]
+pub trait PointeeSized {}
+
+#[lang = "metasized"]
+pub trait MetaSized: PointeeSized {}
+
 #[lang = "sized"]
-pub trait Sized {}
+pub trait Sized: MetaSized {}
 
 #[lang = "legacy_receiver"]
 pub trait LegacyReceiver {}

tests/ui/traits/const-traits/auxiliary/minicore.rs

@@ -18,8 +18,15 @@
 #![no_std]
 #![no_core]
 
+#[lang = "pointeesized"]
+pub trait PointeeSized {}
+
+#[lang = "metasized"]
+pub trait MetaSized: PointeeSized {}
+
 #[lang = "sized"]
-pub trait Sized {}
+pub trait Sized: MetaSized {}
+
 #[lang = "copy"]
 pub trait Copy {}